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It literally grew on users when they dropped the "Ultralight" from Helvetica Neue Ultralight (3rd beta).

It's a widespread misconception, but it's never been ultralight. Screenshot from beta 1: http://cl.ly/PhA6

See the number in the calendar app? That's Ultralight.

Sure, but that's also not the system font.

True enough, I didn't install ios7 on my main phone until beta4/5 so any use prior was mostly on an old 4s just to see if things compiled/ran.